Flat Timber Roof Construction Details

By way of metal flat roof joist hangers.

Flat timber roof construction details.

The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. When building a flat roof it is vital that a degree of falls is built into the construction to ensure rainwater run off. Using timber wall plates. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls.

That will help you remember certain factors and details to build the best possible flat roof. Forms of flat roof construction encountered. The definition of a flat roof according to bs 6229 is having a pitch less than 10 o to the horizontal however some in the industry would consider up to 15 o as their definition of a flat roof. This article covers all manner of flat roofing venting methods and details on how to build a flat garage roof and how to frame a flat roof and also encompasses flat roofs roof decking roof coverings including flat roof felt how to prevent leaks at abutments timber flat roof construction details and parapets and common.

Sizes of joists needed for flat roof construction. Flat roofs became popular amongst early 1900s modernist architects because they removed the often complicated pitched roofs of traditional construction and replaced them with perfect straight lines. So any timber joists that are used need to be strong enough to support this weight. The construction of the flat roof is similar to that of the timber upper floor.

Others would treat even steeper pitches as flat roofs. It dealt in detail with flat roof constructions and can be. Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading. As you may imagine there is a fair amount of weight involved here in terms of boards felt etc.

Old asbestos roofs are often replaced with flat roofs.